The solid–liquid equilibrium (SLE) of electrolyte mixtures Li+, K+, Rb+//borate–H2O at T = 323 K was studied by the isothermal dissolution method, and the X-ray diffraction method was used to confirm the solid-phase compositions. The analysis of phase diagram shows that the graph consists of one three-salt cosaturation invariant point and three regions of crystallization corresponding to single salts Li2B4O7·3H2O, K2B4O7·4H2O, and RbB5O8·4H2O, respectively. From the comparison of phase diagrams of system Li+, K+, Rb+//B4O7 2––H2O between 323 and 348 K, we can conclude that (1) the crystalline form of salts lithium borate, potassium borate, and rubidium borate did not change at 323 and 348 K and (2) the salt Li2B4O7·3H2O crystalline area decreases and the other two salt crystalline areas, K2B4O7·4H2O and RbB5O8·4H2O, increase at 323 K.

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in situ X-ray diffraction (XRD), ionic codoping, Li 3 V 2 (PO 4 ) 3 , theoretical calculations, wide temperature range

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Transition metal phosphides (TMPs) are perplexed by the low electronic/ionic conductivity, volume variations, and unstable reaction interfaces. To tackle these issues, herein, we have proposed a low‐temperature phosphorization strategy by reactions between Co‐based metal‐organic frameworks (MOF) and sodium dihydric hypophosphite to encapsulate monodisperse CoP nanoparticle (∼12 nm) into MOF‐derived hollow and porous carbon nanobox (CoP@PCB). Compared to bare CoP, such CoP@PCB electrode has shown remarkable electrochemical performance, which is highly ascribed to its robust structural feature, pre‐reserved voids, monodisperse CoP nanoparticles, and stable reaction interfaces, as well as fast reaction kinetics. Moreover, the good electrochemical properties of CoP@PCB//LiFePO4 full cells have demonstrated practical possibility. The formation of Co and Li3P as discharged products has corroborated the redox conversion reaction mechanism, as assessed by in‐situ X‐ray diffractions. The favorable function of the carbon shell in boosting both electronic conductivity and lowering diffusion energy barriers has been confirmed by theoretical calculations, demonstrating an important synergistic effect.

More and more people rely on mobile internet devices, they generate a huge amount of data every day. Tourism market also benefit from the use of big data to make tourist persona and identify demands. The article sketches the development situation and problems of big data application in China, and then give a discussion on big data, tourist persona and precise marketing within related research findings. Others applications and some side effects are also referred.

Abstract-As an important part of military support, the development of military logistics has a direct impact on the army's fighting capacity in morden wars. Deserves in-depth study. Potter's "Diamond Model" consists four factors and two variables. Four factors include production factors, demand conditions, related industries and support industries, the enterprise's strategy, structure and competition. Two variables include opportunity and government. In this paper, we use "Diamond Model" to analysis the actuality of Chinese military logistics and find out the existing problems. In the end, we offer some proposals and countermeasures from the perspective of the state, the military and the third party logistics enterprises to enhance the construction of Military Logistics. This article is conducive to comprehend the actuality of Military Logistics in our country and has a positive significance to promote the development of Military Logistics.

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